What is the percentage increase in size when ordering a 14 inch rather than a 12 inch pizza?
A. 16%
B. 26%
C. 36%
D. 46%
C. 36%
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A 4.00 kg object is moving at 5.00 m/s WEST. It strikes a 6.00 kg that is moving WEST at 2.00 m/s. The objects have a one-dimensional elastic collision in the EAST-WEST direction. The velocity of the 6.00 kg object after the collision is
A. 1.40 m/s WEST. B. 1.40 m/s EAST. C. 4.40 m/s EAST. D. 4.40 m/s WEST. E. 3.00 m/s WEST.
A ball is thrown at an angle of ? above the horizontal. If there is no acceleration due to gravity the ball will follow a straight-line path
Indicate whether the statement is true or false
Latitude Lines Run
What will be an ideal response?
The temperature of air flowing through a 25-cm-diameter duct whose inner walls are at 320°C is to be measured with a thermocouple soldered in a cylindrical steel wall of 1.2-cm-OD with an oxidized exterior, as shown in the accompanying sketch. The air flows normal to the cylinder at a mass velocity of 17,600 kg/(h m2). If the temperature indicated by the thermocouple is 200°C, estimate the actual temperature of the air.
GIVEN
• Cylindrical thermocouple wall in an air duct
• Duct diameter (Dd) = 25 cm = 0.25 m
• Duct wall temperature (Tds) = 320°C =m 593 K
• Wall outside diameter (Dw) = 1.2 cm = 0.012 m
• Exterior of wall is oxidized
• Air mass velocity /m A
= 17,600 kg/(h m2)
• Thermocouple indicated temperature (Ttc) = 200°C = 473 K
FIND
• Air temperature (T?) ASSUMPTIONS
• Steady state
• Thermal resistance between the thermocouple and the wall exterior surface is negligible
• Inside of duct behaves as a black body enclosure
• Conduction to the thermocouple wall from the duct wall can be neglected
PROPERTIES AND CONSTANTS
the emissivity of oxidized steel (?) = 0.94. From Appendix 1, Table 5, the Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)